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Re: Question for you guys that are tech savvy

 

Keith has helped me a lot in the past and understands what he is talking about. I don’t think I would have had the knowledge to carry this out on my own without his help.
My Unimat now purrs like a kitten!
Dick
--
http://www.homemadetools.net/forum/?OFF-SET-tailstock-center-65965#post105972
?SMALL TURRET TOOL POST PLANS?
?LARGE TURRET TOOL POST PLANS
?MINI-LATHE CARRIAGE LOCK PLANS
?SMALL QC TOOL POST PLANS?
?QUICK CHANGE LATHE TURRET
?MINI LATHE COMPOUND PIVOT MODIFICATION
Re: Question for you guys that are tech savvy

 

Before going too far I'd look at how the motor will fit. The usual DC motors will fit without modifying anything, and they are not expensive. The main reason for using the motor you have is that you have it. It looks a bit big, it has more power than you need, the revs are low for a Unimat, and decent speed control would require an inverter to give variable frequency. I'd go for the usual 24 V DC motor, which can be fitted straight on. You can now get variable voltage power supplies, like the usual 24 V PWM supplies, but with the speed control section built in, thus simplifying the electrics. Can't find a link to one at the moment. Otherwise using separate power supply and variable speed units is not too difficult to deal with. Making a case for it all is the biggest problem.
Re: Question for you guys that are tech savvy

 

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I may be wrong here, but I thought using a DC motor w/power supply makes for easier/better speed control.?

On Jul 11, 2023, at 9:20 PM, David Derjan <Chillin4life187@...> wrote:

My u90 motor finally gave out after many years of use. So while rummaging around I found a spare 1/4 HP. 1750 rpm AC Marathon motor from my old Taig lathe that I was considering hooking up and using with the Db200. My question is regarding using a speed controller with the motor. I found one that seems to fit my needs, would probably work with the motor and was still pretty affordable. I would like to ask if their is anything I should look out for using this combination and If it would work. Here is the motor info and speed controller info.? Do you guys think this would be a good fit? I really would like to run a single belt and have adjustable speed on my little DB200.? Please help.

<Screenshot_20230711_231237_Samsung Internet.jpg><Screenshot_20230710_015423_Samsung Internet.jpg>
Question for you guys that are tech savvy

David Derjan
 

开云体育

My u90 motor finally gave out after many years of use. So while rummaging around I found a spare 1/4 HP. 1750 rpm AC Marathon motor from my old Taig lathe that I was considering hooking up and using with the Db200. My question is regarding using a speed controller with the motor. I found one that seems to fit my needs, would probably work with the motor and was still pretty affordable. I would like to ask if their is anything I should look out for using this combination and If it would work. Here is the motor info and speed controller info.? Do you guys think this would be a good fit? I really would like to run a single belt and have adjustable speed on my little DB200.? Please help.

Screenshot_20230711_231237_Samsung Internet.jpg
Screenshot_20230710_015423_Samsung Internet.jpg

Re: U3 top slide accurate setting

 

Thanks all for the replies.

Dick, yes, I was prompted by Doug Collinge’s ‘Unimat ER-16 Collet Holder.pdf’ - he uses that method (trig) to set the angle but can measure the distance travelled easily as the normal feed is being used… I guess on the U3 I’d have to use an(other) indicator.

Carl - my mind started thinking lasers and divisions some distance away (I think you could get good precision with something like that) or even cogs for indexing - 45 teeth for the 8 degrees required for a collet holder.

Brian, many thanks for the link to that article, looks interesting.
Re: U3 top slide accurate setting

 

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You may wish to have a look at this project.

Fine angle adjustment for the Unimat 3 topslide
By Maurice Rhodes

Regards,
Brian.

On 11-July-2023 7:22 pm, Peter Brooks wrote:

Has anyone come up with a smart way of setting the angle of cut accurately when using the U3 cross slide - the one used to cut tapers etc?

As well as the woeful 'scale' on the slide you also have the vagaries of tool positioning in the post.

The arrangement on the earlier lathes where the headstock could rotate would in some ways seem to be altogether better.



Re: U3 top slide accurate setting

 

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Hello Peter:

It all depends on how accurate your setting needs to be. For turning a Morse Taper the easy way is to set a good Morse Taper in the lathe and indicate the compound side to match. Other angles the best method is a Sine Bar or ground angle blocks. Using a better protractor would be OK for many applications.

I do agree the protractor on the compound is worthless. On my Smithy Granite the protractor was a strip of printed aluminum and was torn up by the locking nut. It was so bad I finally tore it off.

Carl.

On 7/11/2023 5:22 AM, Peter Brooks wrote:

Has anyone come up with a smart way of setting the angle of cut accurately when using the U3 cross slide - the one used to cut tapers etc?

As well as the woeful 'scale' on the slide you also have the vagaries of tool positioning in the post.

The arrangement on the earlier lathes where the headstock could rotate would in some ways seem to be altogether better.

Re: U3 top slide accurate setting

 

Hello Peter,
I don’t own a Unimat 3, but I can tell you how I set the compound slide on my minilathe. I use a dial travel indicator to measure the amount of slope in a given distance. This method gets my setting spot on every time. You might have to use trigonometry to get the rise or fall if you don’t have it given to you. Think of it as solving for the sides of a triangle.
Dick
--
http://www.homemadetools.net/forum/?OFF-SET-tailstock-center-65965#post105972
?SMALL TURRET TOOL POST PLANS?
?LARGE TURRET TOOL POST PLANS
?MINI-LATHE CARRIAGE LOCK PLANS
?SMALL QC TOOL POST PLANS?
?QUICK CHANGE LATHE TURRET
?MINI LATHE COMPOUND PIVOT MODIFICATION
U3 top slide accurate setting

 

Has anyone come up with a smart way of setting the angle of cut accurately when using the U3 cross slide - the one used to cut tapers etc?

As well as the woeful 'scale' on the slide you also have the vagaries of tool positioning in the post.

The arrangement on the earlier lathes where the headstock could rotate would in some ways seem to be altogether better.
Re: Indexing Attachment

 

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Hello James:

Perhaps you could make adapter parts to use this on another lathe, or as a start to a stand alone dividing head. It looks like you get everything but the lathe spindle.

Carl.

On 7/8/2023 4:12 PM, James Quick wrote:

That is interesting.? I have this set up for a Schaublin 102 lathe.? Brand new, never been mounted.? ?I don't have a Schaublin and it would be a shame to modify this to fit a lathe other than a Schaublin?
Re: Indexing Attachment

 

hi - i have a 102 - what do you want for it with shipping to 12051 - thanks fred
Re: Indexing Attachment

 

The older unimat's also had the 24 tooth one available. Nice big teeth on it.
?Jeff

On Saturday, July 8, 2023 at 09:57:34 PM EDT, David James via groups.io <davebjames@...> wrote:


James,?

These are the options that are available. On the 48 tooth the teeth are pretty close and sharp, one may have to make the teeth shallower on the 60 tooth.






On Sat, 8 Jul 2023 at 23:58, James Quick
<quickj@...> wrote:
I think the best all around "gear" for this indexing attachment would have 60 teeth. This would allow 2.3.4.5.6.10.12.15.20.and 30 divisions from one gear.? Did Unimat have a 60 tooth?

Re: Indexing Attachment

 

James,?

These are the options that are available. On the 48 tooth the teeth are pretty close and sharp, one may have to make the teeth shallower on the 60 tooth.






On Sat, 8 Jul 2023 at 23:58, James Quick
<quickj@...> wrote:
I think the best all around "gear" for this indexing attachment would have 60 teeth. This would allow 2.3.4.5.6.10.12.15.20.and 30 divisions from one gear.? Did Unimat have a 60 tooth?

Re: Indexing Attachment

 

For better pictures of the “worm dividing attachment “ please see my picture album on the minilathe group. “old_toolmaker”
Dick
--
http://www.homemadetools.net/forum/?OFF-SET-tailstock-center-65965#post105972
?SMALL TURRET TOOL POST PLANS?
?LARGE TURRET TOOL POST PLANS
?MINI-LATHE CARRIAGE LOCK PLANS
?SMALL QC TOOL POST PLANS?
?QUICK CHANGE LATHE TURRET
?MINI LATHE COMPOUND PIVOT MODIFICATION
Re: Indexing Attachment

 

Here is a picture of my worm dividing attachment for the mini lathe. Could be scaled down to fit the Unimat DB or SL
--?
http://www.homemadetools.net/forum/?OFF-SET-tailstock-center-65965#post105972
?SMALL TURRET TOOL POST PLANS?
?LARGE TURRET TOOL POST PLANS
?MINI-LATHE CARRIAGE LOCK PLANS
?SMALL QC TOOL POST PLANS?
?QUICK CHANGE LATHE TURRET
?MINI LATHE COMPOUND PIVOT MODIFICATION
Re: Indexing Attachment

 

That is interesting.? I have this set up for a Schaublin 102 lathe.? Brand new, never been mounted.? ?I don't have a Schaublin and it would be a shame to modify this to fit a lathe other than a Schaublin?
Re: Indexing Attachment

 

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I’d be interested?

Best Regards
John



On Jul 8, 2023, at 12:43 PM, Carl <carl.blum@...> wrote:

?

Hi James:

No they didn't. 1:60 is 6? and I think 1:72 would be nice, 5?

If someone was interested in cutting them, how many of us might want them?

Carl.

On 7/8/2023 11:58 AM, James Quick wrote:
I think the best all around "gear" for this indexing attachment would have 60 teeth. This would allow 2.3.4.5.6.10.12.15.20.and 30 divisions from one gear.? Did Unimat have a 60 tooth?

Chip pan

 

Walmart sells a Nordic Ware aluminum bakers half sheet pan.? It can make a good chip pan for many small machines.? The inside dimensions are 17.25 x 12.25.? It is made in the?US, $12.98.

20230708_142429.jpg

Re: Indexing Attachment

 

The one on Ebay is set up for 116, 96, 90, 84, 80, 72, 70, 68, 64, 60, 54, 40, and 24"




On Saturday, July 8, 2023 at 02:25:44 PM EDT, Tom Angell via groups.io <tangell@...> wrote:


Let’s not forget the 60 tooth gear.

On Jul 8, 2023, at 11:58 AM, James Quick <quickj@...> wrote:

I think the best all around "gear" for this indexing attachment would have 60 teeth. This would allow 2.3.4.5.6.10.12.15.20.and 30 divisions from one gear.? Did Unimat have a 60 tooth?

s-l1600.png

Re: Indexing Attachment

 

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Let’s not forget the 60 tooth gear.

On Jul 8, 2023, at 11:58 AM, James Quick <quickj@...> wrote:

I think the best all around "gear" for this indexing attachment would have 60 teeth. This would allow 2.3.4.5.6.10.12.15.20.and 30 divisions from one gear.? Did Unimat have a 60 tooth?

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